Yayınlanmış 1 Ocak 2015 | Sürüm v1
Dergi makalesi Açık

Identification of specific phonon contributions in BCS-type superconductivity of boride-carbide crystals with a layer-like structure

  • 1. Sakarya Univ, Fen Edebiyat Fak, Fiz Bolumu, TR-54187 Adapazan, Turkey
  • 2. Gazi Univ, Fen Fak, Fiz Bolumu, Ankara, Turkey
  • 3. Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

Açıklama

We report On an ab initio study of the BCS-type superconductivity in the intermetallic borocarbides YPd2B2C, YPt2B2C and LaPt2B2C with a layer-like structure. The largest contribution to the electron-phonon coupling constant lambda is identified to come from transverse acoustic phonons at a zone-edge, arking from the atomic vibrations in the boron-transition metal layer. A detailed examination of the atomic geometry in the boron-transition metal layer, the electron-phonon coupling constant lambda, and the logarithmically averaged phonon frequency omega(In), helps explain the relatively higher superconducting temperature T-c of YPd2B2C (20.6 K) compared to that of YPt2B2C (11.3 K) and LaPt2B2C (10.40 K). (C) 2015 Elsevier Ltd. All rights reserved.

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